diff --git a/web/debugger.css b/web/debugger.css
index b9d9f8190..0c64d69b7 100644
--- a/web/debugger.css
+++ b/web/debugger.css
@@ -22,7 +22,10 @@
   font: message-box;
 }
 #PDFBug {
-  background-color: rgb(255 255 255);
+  color-scheme: only light;
+
+  background-color: white;
+  color: black;
   border: 1px solid rgb(102 102 102);
   position: fixed;
   top: 32px;